ArticleBone & joint research2017
The segment-dependent changes in lumbar intervertebral space height during flexion-extension motion.
Article in Bone & joint research, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- Automated Metrics for the Diagnosis of Instability Between the 2nd and 7th Cervical Vertebrae.Bioengineering (Basel, Switzerland) · 2026Article
- Pyroptosis: mechanism and therapeutic strategies with intervertebral disc degeneration.Experimental & molecular medicine · 2026Review
- Automated radiographic metrics for diagnosing lumbar spine instability: a cross-sectional observational study.Quantitative imaging in medicine and surgery · 2025Article
- Variation in spatial distance between the lumbar interlaminar window and intervertebral disc space during flexion-extension.Surgical and radiologic anatomy : SRA · 2021Article
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Authors and funding
8 authors.
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Abstract
objectivesMany studies have investigated the kinematics of the lumbar spine and the morphological features of the lumbar discs. However, the segment-dependent immediate changes of the lumbar intervertebral space height during flexion-extension motion are still unclear. This study examined the changes of intervertebral space height during flexion-extension motion of lumbar specimens.
methodsFirst, we validated the accuracy and repeatability of a custom-made mechanical loading equipment set-up. Eight lumbar specimens underwent CT scanning in flexion, neural, and extension positions by using the equipment set-up. The changes in the disc height and distance between adjacent two pedicle screw entry points (DASEP) of the posterior approach at different lumbar levels (L3/4, L4/5 and L5/S1) were examined on three-dimensional lumbar models, which were reconstructed from the CT images.
resultsAll the vertebral motion segments (L3/4, L4/5 and L5/S1) had greater changes in disc height and DASEP from neutral to flexion than from neutral to extension. The change in anterior disc height gradually increased from upper to lower levels, from neutral to flexion. The changes in anterior and posterior disc heights were similar at the L4/5 level from neutral to extension, but the changes in anterior disc height were significantly greater than those in posterior disc height at the L3/4 and L5/S1 levels, from neutral to extension.
conclusionsThe lumbar motion segment showed level-specific changes in disc height and DASEP. The data may be helpful in understanding the physiologic dynamic characteristics of the lumbar spine and in optimising the parameters of lumbar surgical instruments.
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